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Tham khảo tài liệu 'advances in solid-state lasers: development and applicationsduration and in the end limits part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 32 Advances in Solid-State Lasers Development and Applications incident x-ray energy Io and the other was 310-mm long with Ar-100 gas for transmitted x-ray energy I . The EXAFS data of the Bi Lili edge 13426.5 eV were collected between 12926 and 14526 eV with 481 energy points. Data analysis was carried out on UWXAFS. The back-scattering amplitude and the phase shift were theoretically calculated using FEFF 8.2 code. The Debye-Waller factor was estimated by the Debye code implemented in FEFF 8.2 based on Raman spectroscopy results Narang Patel et al. 1994 . 3.3 Luminescent intensity BÌ2O3 concentration mol Fig. 5. Dependence of luminescent intensity LMI on Bi2O3 concentration detected at 1120-nm luminescence with 500-nm excitation. The dependence of luminescent intensity LMi on Bi2O3 concentration is illustrated in Fig. 5. The measured samples were A-series A1 A5 and C1. The excitation and detection wavelengths of the luminescence were at 500 and 1120 nm respectively. The luminescent intensity nonlinearly increased with increased Bi2O3 concentration. At a 1.0 mol of Bi2O3 concentration the luminescent intensity from A4 which includes 2.3 mol of Al2O3 is three orders of magnitude larger than that of C1 without Al2O3. Based on these results we conclude the following 1. Al2O3 additive can remarkably increase to generate a Bi luminescent center. 2. The generation of a Bi luminescent center has a nonlinear relation for Bi2O3 concentration. 3.4 27Al-NMR spectra 27The Al-NMR spectra in BiSG are shown in Fig. 6 Fujimoto Nakatsuka 2006 . 27Al chemical shifts were measured relative to Al H2O 63 . The measured samples were A-series New Infrared Luminescence from Bi-doped Glasses 33 C2 and a-Al2O3. a-Al2O3 with a 6-fold coordinated state of corundum structure was used as a standard sample and a peak exists at 15 ppm. The peaks at 70 and -40 ppm marked by asterisks were derived from spinning sidebands. The peaks of 27Al-NMR from A1 to A3 only exist at 15 ppm and are the same as
